Question

当我的应用程序启动时，我想在没有用户干预的情况下自动打开保存的最后一个文档。我的计划是将上次保存的文件的位置保存到dataOfType中的user-defaults中。我还将通过在app-controller中的applicationShouldOpenUntitledFile中返回NO来阻止打开无标题文档。所以在理论上这应该是可能的，但如何？如何以编程方式打开文档？

Answer 1

我从Cocoa with Love中找到了这个答案。

- (BOOL)applicationShouldOpenUntitledFile:(NSApplication *)sender
{
    // On startup, when asked to open an untitled file, open the last opened
    // file instead
    if (!applicationHasStarted)
    {
        // Get the recent documents
        NSDocumentController *controller =
            [NSDocumentController sharedDocumentController];
        NSArray *documents = [controller recentDocumentURLs];

        // If there is a recent document, try to open it.
        if ([documents count] > 0)
        {
            NSError *error = nil;
            // point to last document saved
            NSInteger index = 0;
            [controller
                openDocumentWithContentsOfURL:[documents objectAtIndex:index]
                display:YES error:&error];

            // If there was no error, then prevent untitled from appearing.
            if (error == nil)
            {
                return NO;
            }
        }
    }

    return YES;
}

原始链接：Open the previous document on application startup

Answer 2

Swift 4示例:(代码进入您的应用程序代理）

func applicationShouldOpenUntitledFile(_ sender: NSApplication) -> Bool {

    let documentController = NSDocumentController.shared

    if let mostRecentDocument = documentController.recentDocumentURLs.first {
        documentController.openDocument(withContentsOf: mostRecentDocument, display: true, completionHandler: { (document, documentWasAlreadyOpen, errorWhileOpening) in
            // Handle opened document or error here
        })
        return false
    } else {
        return true
    }
}

如何打开自动保存的最后一个文件

2 个答案: